.page-about {
  --cut: 18px;
  --about-space: clamp(56px, 8vw, 112px);
  --about-measure: 34rem;
  padding-bottom: clamp(64px, 9vw, 128px);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  align-items: center;
  padding-bottom: clamp(44px, 6vw, 88px);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-heading);
  font-size: clamp(2.125rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--text);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--teal-400);
}

.page-about .about-hero__lede {
  max-width: var(--about-measure);
  margin: 0 0 clamp(24px, 3vw, 34px);
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__media {
  margin: 0;
  background: var(--ink-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  box-shadow: var(--shadow-glow);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(36px, 5vw, 80px);
  }
}

/* ---------- 区块骨架 ---------- */
.page-about .about-section {
  padding-block: var(--about-space);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-head__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--teal-400);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-head__lede {
  margin: 0;
  max-width: var(--about-measure);
  font-size: clamp(0.9375rem, 1.5vw, 1rem);
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 780px) {
  .page-about .about-head {
    grid-template-columns: 4rem minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: baseline;
    column-gap: clamp(20px, 3vw, 44px);
  }
}

/* ---------- 01 使命 ---------- */
.page-about .mission-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 2.8vw, 28px);
}

.page-about .mission-item {
  position: relative;
  padding: 20px 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .mission-item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 22px;
  background: var(--teal-400);
}

.page-about .mission-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .mission-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .mission-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 36px);
  }
}

/* ---------- 02 索引 ---------- */
.page-about .index-panel {
  padding: clamp(22px, 4vw, 44px);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(41, 224, 230, 0.14), transparent 62%),
    linear-gradient(160deg, var(--petrol-800), var(--ink-900) 78%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .index-ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .index-ledger__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 2px;
  border-bottom: 1px solid rgba(41, 224, 230, 0.18);
  transition: border-color 180ms var(--ease-out);
}

.page-about .index-ledger__item:hover,
.page-about .index-ledger__item:focus-within {
  border-bottom-color: var(--teal-400);
}

.page-about .index-ledger__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--teal-400);
  transform-origin: left center;
  transition: transform 180ms var(--ease-out);
}

.page-about .index-ledger__item:hover .index-ledger__num,
.page-about .index-ledger__item:focus-within .index-ledger__num {
  transform: scale(1.18);
}

.page-about .index-ledger__label {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text);
}

.page-about .index-panel__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(233, 242, 245, 0.14);
  max-width: 46rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist-100);
}

.page-about .index-panel__note a {
  color: var(--teal-400);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 560px) {
  .page-about .index-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 36px);
  }
}

@media (min-width: 1024px) {
  .page-about .index-ledger {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 03 版本 ---------- */
.page-about .version-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--teal-400), var(--magenta-500));
  opacity: 0.55;
}

.page-about .version-node {
  position: relative;
  padding-left: 36px;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--teal-400);
  background: var(--ink-950);
  transition: background-color 180ms var(--ease-out), box-shadow 180ms var(--ease-out);
}

.page-about .version-node:hover::before,
.page-about .version-node:focus-within::before {
  background: var(--magenta-500);
  box-shadow: 0 0 0 4px rgba(255, 61, 154, 0.18);
}

.page-about .version-node__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 8px;
}

.page-about .version-node__num {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  color: var(--magenta-500);
}

.page-about .version-node__phase {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--slate-400);
}

.page-about .version-node h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .version-node p {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .version-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .version-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .version-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

/* ---------- 04 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .team-figure {
  margin: 0;
  background: var(--ink-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .team-stats {
  display: grid;
  gap: 14px;
}

.page-about .stat-card {
  padding: clamp(18px, 2.6vw, 26px);
  background: linear-gradient(150deg, var(--indigo-800), var(--ink-900) 82%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .stat-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.1;
  color: var(--gold-400);
}

.page-about .stat-card__label {
  margin: 8px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 920px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

/* ---------- 05 技术 ---------- */
.page-about .tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .tech-list__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .tech-list__key {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--teal-400);
}

.page-about .tech-list__desc {
  margin: 0;
  max-width: 48rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .tech-list__item {
    grid-template-columns: minmax(0, 8rem) minmax(0, 2fr);
    align-items: baseline;
    gap: clamp(20px, 4vw, 60px);
  }
}

/* ---------- 06 场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: clamp(16px, 2.5vw, 24px);
}

.page-about .scene-card {
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(150deg, rgba(27, 33, 69, 0.92), rgba(11, 18, 26, 0.94));
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .scene-card__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--magenta-500);
}

.page-about .scene-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .scene-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 720px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  margin-top: var(--about-space);
  padding: clamp(28px, 5vw, 56px);
  background:
    radial-gradient(110% 150% at 0% 0%, rgba(255, 61, 154, 0.16), transparent 62%),
    linear-gradient(120deg, var(--wine-800), var(--ink-900) 72%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

.page-about .about-closing__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--gold-400);
}

.page-about .about-closing__title {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-closing__lede {
  margin: 0 0 clamp(22px, 3vw, 32px);
  max-width: var(--about-measure);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist-100);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-closing__link {
  font-size: 0.875rem;
  color: var(--teal-400);
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-ledger__item,
  .page-about .index-ledger__num,
  .page-about .version-node::before {
    transition: none;
  }

  .page-about .index-ledger__item:hover .index-ledger__num,
  .page-about .index-ledger__item:focus-within .index-ledger__num {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>